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From "Amareshwari Sri Ramadasu (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-1900) the heartbeat and task event queries interval should be set dynamically by the JobTracker
Date Thu, 15 Nov 2007 11:21:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12542737
] 

amareshwari edited comment on HADOOP-1900 at 11/15/07 3:20 AM:
----------------------------------------------------------------------------

Now considering only cluster size for varying heartbeat interval,  the propasal is as follows:

1. Heartbeat interval = max(2, clusterSize/50+1)
i.e. for every 50 nodes, we increase the heartbeat interval by 1 second.

2. Map completion events polling interval can take the same value as heartbeat interval.
Apart from polling, the tasktracker will also fetch map events from the JobTracker when a
reducetask asks for events and it has nothing to give (this is similar to the way tasktrackers
ask for a new task whenever it finishes executing a task)

Thoughts?

      was (Author: amareshwari):
    Now considering only cluster size for varying heartbeat interval,  the propasal is as
follows:

1. Heartbeat interval = max(2, clusterSize/50+1)
i.e. for every 50 nodes, we increase the heartbeat interval by 1 second.

2. Map completion events polling interval can take the same value as heartbeat interval.
mapEventsFetcherThread will be notified if a reduce task doesnt find map events at the tasktracker.

Thoughts?
  
> the heartbeat and task event queries interval should be set dynamically by the JobTracker
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1900
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1900
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Owen O'Malley
>            Assignee: Amareshwari Sri Ramadasu
>         Attachments: patch-1900.txt, patch-1900.txt
>
>
> The JobTracker should scale the intervals that the TaskTrackers use to contact it dynamically,
based on how the busy it is and the size of the cluster.

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